1.75n^2-31.5n-105=0

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Solution for 1.75n^2-31.5n-105=0 equation:


Simplifying
1.75n2 + -31.5n + -105 = 0

Reorder the terms:
-105 + -31.5n + 1.75n2 = 0

Solving
-105 + -31.5n + 1.75n2 = 0

Solving for variable 'n'.

Begin completing the square.  Divide all terms by
1.75 the coefficient of the squared term: 

Divide each side by '1.75'.
-60 + -18n + n2 = 0

Move the constant term to the right:

Add '60' to each side of the equation.
-60 + -18n + 60 + n2 = 0 + 60

Reorder the terms:
-60 + 60 + -18n + n2 = 0 + 60

Combine like terms: -60 + 60 = 0
0 + -18n + n2 = 0 + 60
-18n + n2 = 0 + 60

Combine like terms: 0 + 60 = 60
-18n + n2 = 60

The n term is -18n.  Take half its coefficient (-9).
Square it (81) and add it to both sides.

Add '81' to each side of the equation.
-18n + 81 + n2 = 60 + 81

Reorder the terms:
81 + -18n + n2 = 60 + 81

Combine like terms: 60 + 81 = 141
81 + -18n + n2 = 141

Factor a perfect square on the left side:
(n + -9)(n + -9) = 141

Calculate the square root of the right side: 11.874342087

Break this problem into two subproblems by setting 
(n + -9) equal to 11.874342087 and -11.874342087.

Subproblem 1

n + -9 = 11.874342087 Simplifying n + -9 = 11.874342087 Reorder the terms: -9 + n = 11.874342087 Solving -9 + n = 11.874342087 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + n = 11.874342087 + 9 Combine like terms: -9 + 9 = 0 0 + n = 11.874342087 + 9 n = 11.874342087 + 9 Combine like terms: 11.874342087 + 9 = 20.874342087 n = 20.874342087 Simplifying n = 20.874342087

Subproblem 2

n + -9 = -11.874342087 Simplifying n + -9 = -11.874342087 Reorder the terms: -9 + n = -11.874342087 Solving -9 + n = -11.874342087 Solving for variable 'n'. Move all terms containing n to the left, all other terms to the right. Add '9' to each side of the equation. -9 + 9 + n = -11.874342087 + 9 Combine like terms: -9 + 9 = 0 0 + n = -11.874342087 + 9 n = -11.874342087 + 9 Combine like terms: -11.874342087 + 9 = -2.874342087 n = -2.874342087 Simplifying n = -2.874342087

Solution

The solution to the problem is based on the solutions from the subproblems. n = {20.874342087, -2.874342087}

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